<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./js/vue.js"></script>
    <style>
        #app{
            border: 2px solid black;
            padding: 10px;
            margin-bottom: 400px;
        }
        .child{
            margin: 20px;
            padding: 10px;
            background-color: #cccccc;
        }
    </style>

</head>
<body>
    <div id="app">
        <h3>父组件范围</h3>
        <p>msg: {{ msg }}</p>
        <input type="text" v-model="msg">
        <child-one :msg="msg" @send-msg="setMsg"></child-one>
    </div>

    <template id="ChildOne">
        <div class="child">
            <h3>子组件</h3>
            <p>msg:{{ msg }}</p>
            <input type="text" v-model="msg">
            <input type="text" :value="msg" @input="sendMsg($event.target.value)">
            <input type="button" value="设置MSG" @click="sendMsg('按钮参数')" >
        </div>
    </template>
</body>
<script>
    Vue.component("ChildOne",{
        template:"#ChildOne",
        props:["msg"],
        methods: {
            sendMsg(nv){
                this.$emit("send-msg",nv);
            }
        },
    })
    new Vue({
        el:"#app",
        data:{
            msg:"msg变量"
        },
        methods:{
            setMsg(arg){
                this.msg = arg;
            }
        }
    })
</script>
</html>